Issue with better_errors in a Sinatra app in GitHub Codespace environment

[bpurinton]

I can run better_errors in my local dev environment, but when I try to do the same on a GitHub Codespace cloud IDE, I still get the classic error page. I have tried a number of different images in the devcontainer.json file that Codespaces builds on, but nothing is working.

Per the documentation, I added to my Gemfile:

group :development do
  gem "better_errors"
  gem "binding_of_caller"
end

And to the top of the Sinatra app.rb:

require "better_errors"

configure :development do
  use BetterErrors::Middleware
  BetterErrors.application_root = __dir__
end

But I always get the same classic error page rather than the better_errors version.

These steps appear to work fine in a Rails app, but not with Sinatra. Are there additional gem requirements I am missing? Has anyone else had an issue with better_errors in a GitHub Codespace IDE?

Thanks in advance!

Edit: I'm trying to follow the stack trace of an error and I note that this line in middleware.rb is called out:

https://github.com/BetterErrors/better_errors/blob/master/lib/better_errors/middleware.rb#L62

I'm not sure what the issue is with that @app.call env line in Sinatra.

[bpurinton]

Okay, finally traced the issue using this SO post: https://stackoverflow.com/questions/27117443/why-doesnt-better-errors-work-on-cloud-9-ide

Fix for Codespaces and potentially all other Cloud IDEs:

1. echo "export TRUSTED_IP='0.0.0.0/0.0.0.0'" >> ~/.bashrc

2. source ~/.bashrc

3. In the configuration:

use BetterErrors::Middleware
BetterErrors.application_root = __dir__
BetterErrors::Middleware.allow_ip! ENV['TRUSTED_IP'] if ENV['TRUSTED_IP']